Amazon active, Herbalife soars on buy offer

SAN FRANCISCO (MarketWatch) -- Shares of Amazon.com Inc. were active Friday evening as investors continued to digest the company's quarterly results, while shares of Herbalife Ltd. shot up 18% after the nutritional supplement maker said that it has received a buyout offer.

The Nasdaq-100 After Hours Indicator, which tracks evening trading of the index's leading technology stocks, fell 0.47 point to 1,791.66.

Amazon
AMZN, -1.80%
shares slipped a penny to end at $37.39. Shares fell 3.4% in regular trading as investors became concerned about margin pressures on the online-shopping giant, including a narrower operating margin than expected during the holiday season. Amazon reported its fourth-quarter results late Thursday. See full story.

Shares of Herbalife
HLF, -1.46%
jumped 18% to $39.16. The company said it has received an acquisition offer of $38 a share from Whitney V L.P. and its affiliates. The offer represents a 14.8% premium to the Herbalife's regular-session closing price of $33.10.

Whitney and its related parties already own roughly 27% of Herbalife's outstanding stock. Herbalife said it would review the offer but gave no assurances that it would accept it.

Rackable Systems Inc.
RACK, +0.00%
meanwhile, gave up 3 cents to end at $16.66, after sliding 18% during the day session.

The computer server and data-storage company posted fourth-quarter net earnings Thursday evening of $563,000, or 2 cents a share, down 92% from $7.31 million or 32 cents a share during the year-ago period. Adjusted net earnings excluding stock-based compensation and other items were 19 cents a share.

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